Analysis of geological materials for bismuth, antimony, selenium and tellurium by continuous flow hydride generation inductively coupled plasma mass spectrometry. Part 1. Mutual hydride interferences
Analysis of geological materials for bismuth, antimony, selenium and tellurium by continuous flow hydride generation inductively coupled plasma mass spectrometry. Part 1. Mutual hydride interferences
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发表时间：
1997
影响因子：
3.4
通讯作者：
G. Hall;J. Pelchat
中科院分区：
文献类型：
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作者：
G. Hall;J. Pelchat
研究了氢化物发生电感耦合等离子体质谱(HG-ICP-MS)测定Bi、Sb、Se、Te时的相互干扰。该研究的设计基于这些元素在地质材料（王水和 HF-HClO 4 -HNO 3 -HCl）常用的两种酸消化程序后出现的价态，即 Bi III 、Sb V 、Se IV 和 Te IV 。两种价态的砷（III 和 V）也被检查为潜在干扰物，但 Ge、Sn 和 Pb 则不然，因为它们在所用 HCl 浓度（2-4 M）下形成的氢化物可以忽略不计。研究浓度高达 2000 μg l -1 的干扰物，而分析物浓度保持在 0.2 μg l -1 。 AS V 和 Se IV 严重抑制了 2 M HCl 和 4 M HCl 中的 Te 信号，但在强酸性介质中抑制作用较小。通过添加 KI 和抗坏血酸（最终浓度为 0.005%），将 As V 还原为非干扰态 As III，将 Se IV 还原为 Se O，从而消除了这些干扰。选择 4 M HCl 为首选酸性介质有两个原因：减少干扰；样品之间的清洗时间更短（即记忆效应降低）。可能引起关注的相互干扰包括以下影响： Bi 过量 2500 倍对 Te 的测量； Te比Bi过量5000倍； Bi 比 Sb 过量 2500 倍； Bi 比 Se 过量 5000 倍。然而，地质材料（岩石、沉积物、土壤、植被）中的这些相对丰度将是非常大的，因此建议方案的实施应通过 HG-ICP-MS 对 Bi、Sb、Se 和 Te 进行分析，且不会相互干扰。
A study was made of mutual interferences in the determination of Bi, Sb, Se and Te by hydride generation inductively coupled plasma mass spectrometry (HG-ICP-MS). The design of the study was based upon the valency states in which these elements would occur following two acid digestion procedures commonly used for geological materials (aqua regia and HF-HClO 4 -HNO 3 -HCl), that is, as Bi III , Sb V , Se IV and Te IV . Arsenic in its two valency states (III and V) was also examined as a potential interferent but Ge, Sn and Pb were not, as formation of their hydrides at the concentration of HCI used (2-4 M) would be negligible. Interferents were investigated at concentrations up to 2000 μg l -1 while the analyte concentration was held at 0.2 μg l -1 . AS V and Se IV severely suppressed the signal for Te in both 2 and 4 M HCl, though less so in the stronger acid medium. These interferences were negated by reduction of As V to the non-interfering state As III and Se IV to Se O by addition of KI and ascorbic acid at a final strength of 0.005%. The preferred acid medium was selected as 4 M HCI for two reasons: interferences were reduced; and wash-out time between samples was shorter (i.e., decreased memory effect). Mutual interferences of possible concern comprise the effect of: 2500-fold excess of Bi on the measurement of Te; a 5000-fold excess of Te on Bi; a 2500-fold excess of Bi on Sb; and a 5000-fold excess of Bi on Se. However, these relative abundances in geological materials (rocks, sediments, soils, vegetation) would be extraordinary and hence implementation of the recommended scheme should produce analysis for Bi, Sb, Se and Te by HG-ICP-MS that is free of mutual interference.